This second data release of the MUSE Hubble Ultra Deep Field surveys is a major update of the DR1 published in [1]} and [2]}. Like DR1, it is based on deep MUSE GTO observations of the HST UDF area. It covers a field of view of \({\rm 3 \times 3 \, arcmin^2}\)  at a 10-hour depth (MOSAIC) and \({\rm 1 \times 1 \, arcmin^2}\)  at a 31-hour depth (UDF-10), with much improved data reduction and data analysis processes compared with DR1. A new data set, the MUSE extremely deep field (MXDF), also located in the UDF XDF area and covering an approximatively circular area of 1 arcmin in diameter, has been pushed to a depth of 141 hours. This data set benefits from an improved spatial resolution of 0.55 arcsec at 7000Å, thanks to the GLAO AOF system.
